GB2271131A - Dedicated perforated nipple with integral isolation sleeve - Google Patents
Dedicated perforated nipple with integral isolation sleeve Download PDFInfo
- Publication number
- GB2271131A GB2271131A GB9319590A GB9319590A GB2271131A GB 2271131 A GB2271131 A GB 2271131A GB 9319590 A GB9319590 A GB 9319590A GB 9319590 A GB9319590 A GB 9319590A GB 2271131 A GB2271131 A GB 2271131A
- Authority
- GB
- United Kingdom
- Prior art keywords
- nipple
- production
- sidewall
- tubular
- well
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 210000002445 nipple Anatomy 0.000 title claims abstract description 107
- 238000002955 isolation Methods 0.000 title claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 claims abstract description 76
- 239000004568 cement Substances 0.000 claims abstract description 24
- 230000008878 coupling Effects 0.000 claims abstract description 6
- 238000010168 coupling process Methods 0.000 claims abstract description 6
- 238000005859 coupling reaction Methods 0.000 claims abstract description 6
- 239000004020 conductor Substances 0.000 claims description 19
- 238000007789 sealing Methods 0.000 claims description 10
- 230000002452 interceptive effect Effects 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 239000000725 suspension Substances 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims 1
- 239000012530 fluid Substances 0.000 abstract description 13
- 239000002360 explosive Substances 0.000 abstract description 10
- 230000002829 reductive effect Effects 0.000 abstract description 10
- 230000015572 biosynthetic process Effects 0.000 description 26
- 238000005755 formation reaction Methods 0.000 description 26
- 239000004215 Carbon black (E152) Substances 0.000 description 5
- 229930195733 hydrocarbon Natural products 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 150000002430 hydrocarbons Chemical class 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 230000001681 protective effect Effects 0.000 description 4
- 230000035515 penetration Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000005474 detonation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 125000001183 hydrocarbyl group Chemical group 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000002147 killing effect Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000003129 oil well Substances 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B29/00—Cutting or destroying pipes, packers, plugs, or wire lines, located in boreholes or wells, e.g. cutting of damaged pipes, of windows; Deforming of pipes in boreholes or wells; Reconditioning of well casings while in the ground
- E21B29/10—Reconditioning of well casings, e.g. straightening
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/12—Valve arrangements for boreholes or wells in wells operated by movement of casings or tubings
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/06—Valve arrangements for boreholes or wells in wells
- E21B34/14—Valve arrangements for boreholes or wells in wells operated by movement of tools, e.g. sleeve valves operated by pistons or wire line tools
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/02—Subsoil filtering
- E21B43/10—Setting of casings, screens, liners or the like in wells
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/11—Perforators; Permeators
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/11—Perforators; Permeators
- E21B43/116—Gun or shaped-charge perforators
Abstract
A production nipple (22) is suspended within an uncased bore hole in a slimhole/monobore completion. A deposit of cement 42 is conveyed through the nipple and is spotted in the annulus across the face of the uncased well bore, with the nipple and cement deposit thereafter being perforated by a small diameter perforating gun (44). The production nipple has a thin walled section (58A) which is characterised by reduced resistance to perforation by a shaped explosive charge. The perforating gun is accurately positioned in registration with the dedicated nipple section by an annular locator slot (74) formed on a coupling sub, which is engageable by a resilient latch arm (76) carried by the perforating gun. An isolation sleeve 64 can be raised to cover the perforations and thus prevent inward flow of unwanted fluids. <IMAGE>
Description
2 A027 113 1 DEDICATED PERFORATABLE NIPPLE WITH INTEGRAL ISOLATION SLEEVE
This invention relates generally to apparatus for completing downhole wells, and in particular to flow conductors for conveying inflowing formation fluid in water, oil, gas and recovery wells.
In the course of completing an oil and/or gas well, it is common practice to run a string of protective casing or liner into the well bore and then to run Production tubing inside the casing. The annulus between the liner or casing and the surrounding formation is sealed with a deposit of cement to prevent fluid flow is through the external annulus from one formation zone to another. The cement is pumped through a work string suspended within the casing or liner into the annular space between the liner or casing and the surrounding well bore.
If the lining or casing traverses a hydrocarbon bearing formation, the lining is perforated to create flow apertures through the casing and cement so that the formation fluids can flow into the well. The liner and/or well casing is perforated by a perforating gun which is suspended within the well. Shaped explosive charges carried by the gun blast openings through the metal lining, the cement deposit and the surrounding formation.
2 In some completions, however, the well bore is uncased, and an open face is established across the oil or gas bearing zone. open bore hole (uncased) arrangements may be utilized, for example, in water wells, test wells and horizontal/deviated well completions.
Some open bore hole (uncased) installations are known as 'Islimholell or llmonoborell completions in which a protective liner or casing is not installed across the productive zone. In such completions, a small diameter flow conductor is suspended within the uncased bore hole and cement is pumped through the flow conductor into the annulus between the flow conductor and the surrounding earth formation. After cement residue is cleaned from is the flow conductor, the flow conductor and the surrounding cement deposit are perforated to admit formation fluid into the well.
Because of the economies associated with slimhole/monobore completions, there is a continuing interest in improving the flow conductors used in such completions. There is a need for a small diameter production nipple which can be used in vertical as well as deviated uncased well bores, wherein the production nipple can be used to spot an annular deposit of cement across.the face of the uncased well bore, with the nipple and protective cement deposit thereafter being perforated reliably by a small diameter perforating gun. There is also a need for a production nipple of the character 3 described which can be closed and reopened in response to changing conditions in the producing zone.
The present invention is concerned with the provision of a method and apparatus for locating a perforating gun within a production nipple in a slimhole/monobore completion, and with a production nipple for use in slimhole/monobore completions, in particular with a production nipple in which improved puncture of the nipple sidewall and penetration into the formation are realised.
The present invention is also concerned with the provision of production nipples having a reduced resistance to perforation by a shaped explosive charge, and which can be opened for production or selectively is closed for isolating a zone which may be producing an excessive amount of gas or water.
In one form of the invention a production nipple, designed for suspension from a flow conductor within an uncased well bore, includes a tubular mandrel having a longitudinal production bore. The tubular mandrel includes first and second longitudinally spaced sidewall sections, with one of the sidewall sections being dedicated for perforation by a perforating gun.. The dedicated sidewall section is characterised by having - a lower resistance to perforation by a shaped charge as compared to the perforation resistance of the other sidewall section. Preferably, the tubular mandrel is intersected by a longitudinal counterbore along the 4 dedicated sidewall section of the mandrel, with the radial thickness of the dedicated sidewall section being less than the radial thickness of the production bore mandrel section. An isolation sleeve is received in slidable, sealing engagement against the production bore of the nipple mandrel, and is shiftable from a first position in which the dedicated sidewall section is covered by the isolation sleeve to a second position in which the dedicated sidewall section is uncovered.
In a preferred embodiment, the nipple is suspended within the well bore on a tubular coupling sub. The coupling sub is radially intersected by an internal, annular locator slot. A resilient latch arm carried on a perforating gun is movable from a retracted, non- is interfering position to a radially extended, latched position in which the latch arm is received within the locator slot. According to this arrangement, the perforating gun is located precisely in shoot alignment with the dedicated sidewall section of the production nipple. Because of the reduced radial thickness of the dedicated sidewall section, reliable puncture and penetration through the nipple, cement deposit and earth formation can be obtained with a smaller, less powerful explosive charge.
Other features and advantages of the present invention will be appreciated by those skilled in the art upon reading the.detailed description which follows with reference to the attached drawings. In the drawings:
Fig. 1 is a simplified schematic diagram showing a vertical section through two producing formations which are intersected by an uncased well bore which has been completed with two production nipples suspended from a 5 retrievable packer; Fig. 2 is a simplified, sectional view which illustrates perforation of the production nipple, cement deposit and formation in a slimhole/monobore completion; Fig. 3 is a longitudinal sectional view of the production nipple of Fig. 1 showing the isolation sleeve in its uncovered position with the dedicated section of the production nipple being exposed for perforation; Fig. 4 is a view similar to Fig. 3 in which the isolation sleeve is in its covered position in which the is dedicated sidewall of the production nipple is sealed; Fig. 5 is a longitudinal sectional view of the slimhole/monobore completion showing the production of formation fluid through the perforated nipple; Fig. 6 is a view similar to Fig. 3 in which fluid flow through the production nipple has been terminated by an isolation sleeve; and, Fig. 7 is a simplified, sectional view which illustrates a horizontal well completion in an uncased bore hole in which multiple production nipples are positioned in registration with multiple producing zones.
In the description which follows, like parts are indicated throughout the specification and drawings with the same reference numerals, respectively. The drawings
6 are not necessarily to scale and the proportions of certain parts have been exaggerated to better illustrate details of the invention.
Referring now to Fig. 1, a first hydrocarbon formation 10 and a second hydrocarbon formation 12 are intersected by an uncased well bore 14. The uncased well bore 14 is sealed from the surface by a primary casing string 16, having an 11 inch diameter, which is secured to the wellhead assembly. Intermediate zones of the uncased well bore 14, are isolated by an intermediate casing string 18, having a 751a inch (194mm) diameter, and a final casing string 20, having a 55 inch (140mm) casing diameter.
The well 14 is completed by multiple nipple sections 22,24 which are connected by a threaded union T in flow communication by flow conductors 26,28. The flow conductor 28 is suspended from a retrievable packer 30 which is releasably set in engagement against the bore of the lowerm,Pst casing 20. The retrievable production packer 30 includes a mandrel 32 having a longitudinal production bore 34 for conveying formation fluid to the surface. The packer mandrel bore is coupled in fluid communication with a string of 35 inch (89mm) production tubing 36 by a full bore landing nipple 38. Production flow through the production tubing string 36 is controlled by a tubing retrievable safety valve 40.
Before the production tubing 36 is installed in the full bore landing nipple 38, a work string is coupled 7 to the landing nipple and a predetermined volume of cement is pumped through the packer bore, the flow conductors 26,28 and the production nipples 22,24. The annulus surrounding the suspended flow conductors and production nipples is filled with a cement deposit 42 which prevents vertical flow of formation fluid between the hydrocarbon formation 10 and the hydrocarbon formation 12. A seal plug is introduced into the bore of the work string to separate the cement from the displacing fluid and to wipe the cement from the packer bore, the flow conductor bores and the nipple bores as the cement is displaced out of the tubing and into the surrounding annular space.
After the seal plug has-been removed and the is production bores have,been cleared of debris, a perforating gun 44 is positioned within the bore of each nipple. The perforating gun 44 is suspended and run into the well on a tubing string. Preferably, the tubing string is a length of coil tubing having a firing line inside. The perforating gun assembly 44 is equipped with a mandrel 46 which includes an array of explosive, jettype perforating charges 48. The perforating gun 44 is coupled to the flow conductor 28 by a locator sub 50.
Upon detonation, each explosive charge 48 produces a high temperature, high pressure plasma jet 52 which penetrates the sidewall of the nipple 22, the protective cement layer 42 and the surrounding.formation 12. The high temperature, high pressure plasma jet 52 8 penetrates the metal sidewall of the nipple, thus producing a clean perforation 54 through the nipple sidewall and an irregular fracture 56 through the surrounding concrete layer and earth formation.
Preferably, the shoot is performed with the well in an underbalanced pressure condition relative to the surrounding formation. With a sufficiently high pressure differential, the pressure surge from the surrounding formation will break up any compacted material and sweep it back in the well bore where it will be flowed to the surface. As compacted fragments are swept away, the nipple sidewall perforations 54 are cleaned and cleared for maximum inflow. After the perforating gun 44 is removed from the well, the well is then ready for is immediate production.
Referring now to Fig. 3 and Fig. 4, the production nipple 22 includes a tubular mandrel 58 which includes first and second longitudinally spaced sidewall sections 58A,58B. According to one-aspect of the present invention, one of the mandrel sidewall sections, in this instance section 58A, is dedicated for perforation by a perforating gun, and is characterised by a lower resistance to perforation in response to the explosive force of a shaped charge as compared to the perforation resistance of the other sidewall section 58B. The differential resistance to perforation is obtained, according to one aspect of the present invention, by forming the dedicated sidewall section 58A with a reduced 9 radial thickness as compared to the sidewall thickness of the nipple section 58B.
The mandrel section 58B is intersected by a longitudinal production bore 60, and the dedicated sidewall section 58A is intersected by a longitudinal counterbore 62 which extends along the length of the dedicated sidewall section 58A. According to this arrangement, the main production bore 60 is enlarged by the counterbore 62 along the length of the dedicated sidewall section. The radial thickness of the dedicated sidewall section 58A is reduced substantially with respect to the thickness of the nipple sidewall section 58B, as shown in Fig. 4. In those illustrations where the nipples support very little hang weight, the radial is thickness of the dedicated sidewall section 58A can be reduced substantially relative to the thickness of the nipple sidewall section 58B.
According to another aspect of the present invention, an isolation sleeve 64 is incorporated within the production nipple 22 for the purpose of selectively isolating a particular production zone at any time during the life of the well. That is, the isolation sleeve 64 is shifted to a non-interfering position, as shown in Fig. 2, in which the dedicated sidewall.section 58A is exposed to the perforating gun 44. The isolation sleeve 64 is also movable to a closed position, as shown in Fig. 4, in which the perforated, dedicated sidewall section is sealed for the purpose of isolating the zone which may be producing an excessive amount of gas or water.
The isolation sleeve 64 is received in slidable, sealing engagement against the production bore 60 of the nipple mandrel. The isolation sleeve 64 is provided with shifting shoulders 64A,64B which are engagable by a shifting tool supported on a wire line or by a coiled tubing string. Although the exemplary embodiment shows that the dedicated nipple sidewall section 58A is arranged for exposure by downshifting the isolation sleeve 64, it will be appreciated that the respective positions of the dedicated nipple section 58A and nipple section.58B could be reversed, with the isolation sleeve 64 being shifted upwardly for exposure of the dedicated sidewall sectibn.
As can best be seen in Fig. 4, the isolation sleeve-64 spans the complete length of the dedicated sidewall section 58A, with the counterbore 62 being sealed with respect to the production bore 60 by first:
and second annular seal members 68,70, respectively. The annular-seal members 68,70 are curved, molded seals which are carried in annular slots formed in the shifting shoulders 66A,66B, respectively.
Referring to Fig. 5, the isolation sleeve 64 is received within the production bore 60 of the nipple mandrel 58 in a non-interfering position in which the dedicated sidewall section 58A of the nipple is uncovered, thus permitting the flow of formation fluid through the nipple perforations 56, as indicated by the arrows 72. As shown in Fig. 6, the dedicated section 58A is completely covered by the isolation sleeve 64, and the counterbore 62 is sealed by the annular seals 68,70, thus preventing the inflow of formation fluid through the 5 nipple perforations 56.
In some installations, the flow conductor 28 is suspended directly from the wellhead, with one or more production nipples 22,24 being suspended within an uncased well bore, typically in a shallow slimhole/ monobore well completion. In such installations, the perforating gun 44 may be located accurately when the depth of the production nipple is known. The operator runs the perforating tool until the length of the coiled tubing corresponds with the known depth of the production is nipple. However, that method becomes less accurate for deep wells, in particular for wells which may have lateral deviations.
Referring now to Fig. 2, accurate positioning of the perforating gun 44 is provided by an annular locator slot 74 formed on the flow conductor 28, and a resilient, deflectable latch arm 76 carried on the locator sub 50. The resilient, deflectable latch arm 76 is movable from a retracted, non-interfering position which permits travel of the perforating gun 44 through the production bore, to a radially extended, latched position, as shown in Fig. 2, in which it is received within the locator slot 74. According to this arrangement, the perforating gun 44 is located precisely in shoot alignment with the dedicated 12 sidewall section 58A of the production nipple 22. The longitudinal distance of the dedicated nipple sidewall section 58A relative to the locator slot 74 is known, and the length of the perforating gun 46 relative to the latch arm 76 is adjusted with a coupling sub 78 so that the explosive charges 48 are centered in shoot alignment along the length of the dedicated nipple sidewall section 58A when the latch arm 76 is received in detented engagement with the locator slot 74.
It will be appreciated that because of the reduced radial thickness of the dedicated nipple sidewall section 58A, reliable puncture and penetration through the nipple 22, cement deposit 42 and earth formation 10 can be obtained with a smaller, less powerful explosive is charge.- Since a less powerful explosive charge is required, the perforating gun 46 can be physically smaller in diameter, and can be run through the small diameter production tubing (35 inch or smaller) utilized in slimhole/monobore completions. Because of the reduced sizing provided by the production nipple, the well may be drilled with a smaller rig, less well control material is required during drilling of the bore hole, the quantity of cement required is reduced, and the size and quantity of casing and tubing required to complete the well are reduced. Moreover, the well may be completed on coiled tubing, thus further reducing the cost of the completion string and reducing the overall time required for installation. Since coiled tubing may be utilized, the 13 well may be completed or recompleted without the necessity of killing the well, thereby reducing the potential for damage to the reservoir. Moreover, in multizone completions, the production nipples may be opened and closed as desired, either sequentially or selectively, for isolating a zone which may be producing too much water or gas. The production nipples of the present invention may also be used in uncased, horizontal completions as shown in Fig. 7.
Although the invention has been described with reference to an oil well completion, and with reference to particular preferred embodiments, the foregoing description is not intended to be construed in a limiting sense. The production nipple of the present invention is may be used to good advantage in alternative applications, for example, in gas wells, environmental wells, including monitoring wells, recovery wells and disposal wells. It is therefore contemplated that the invention includes any such applications which incorporate the production nipple disclosed.
14
Claims (1)
1. A production nipple for completing a well comprising:
a tubular mandrel having an internal longitudinal production bore, said tubular mandrel having first and second longitudinally spaced sidewall sections, one of said sidewall sections being dedicated for perforation by a perforating gun, said dedicated sidewall section being characterised by having a lower resistance to perforation by a shaped charge as compared to the perforation resistance of said other sidewall section.
2. A production nipple for completing a well is comprising:
a tubular mandrel having a first sidewall section intersected by a longitudinal production bore and having a second sidewall section intersected by a longitudinal counterbore along a dedicated sidewall section of said mandrel, wherein the radial thickness of the dedicated sidewall section is less than the radial thickness of said first sidewall section.
3. A well completion apparatus comprising, in combination: a tubular flow conduit adapted for suspension within a well; and a nipple coupled to said flow conduit, said is nipple having a tubular mandrel and a longitudinal production bore, said tubular mandrel having a dedicated sidewall section characterised by having a lower resistance to perforation by a shaped charge as compared 5 to the perforation resistance of said mandrel.
4. Well completion apparatus as defined in claim 3, including: latch apparatus mounted on said flow conduit for locating a perforating gun at a predetermined service position adjacent to the dedicated sidewall section of said nipple.
5. Well completion apparatus as defined in claim 4, is said flow conductor having a tubular sidewall radially intersected by an internal, annular locator slot, and said latch apparatus including a resilient latch arm carried by said perforating gun, said latch arm being movable from a radially retracted, non-interfering position to a radially extended, latched position in which said latch arm is received within said locator slot.
6. A production nipple as defined in claim 1 or claim 2 or well completion apparatus as defined in any one of claims 3 to 5, including: an isolationsleeve disposed in slidable, sealing engagement against the internal bore of said 16 tubular mandrel or nipple, said isolation sleeve being shiftable along the longitudinal axis of internal bore between alternative positions covering and uncovering the dedicated sidewall section of said mandrel or nipple.
7. Well completion apparatus comprising, in combination: a packer having means for engaging a well casing and having a longitudinal bore for passing a service tool to and from a well location below the packer; a tubular flow conduit coupled to said packer for suspension within the well; a tubular nipple having an internal bore coupled to said flow conduit; and is coacting latch apparatus coupled to said flow conduit and to the service tool for locating the service tool at a predetermined service position within the bore of the tubular nipple.
8. Well completion apparatus as defined in claim 7, including:
an isolation sleeve disposed in slidable, sealing engagement against the internal bore of said tubular nipple, said isolation sleeve being shiftable along the longitudinal axis of internal bore between alternative positions covering and uncovering a sidewall section of said nipple.
17 9. A production nipple as defined in claim 1 or claim 2 or well completion apparatus as defined in any one of claims 6 to 8, including:
first and second longitudinally spaced annular seal members disposed in slidable, sealing engagement between said isolation sleeve and said bore of the nipple, said nipple and first and second annular seal members engaging said bore when said sleeve is in the covered position.
10. Well completion apparatus as defined in claim 7, said nipple having a tubular sidewall and a longitudinal production bore, said tubular sidewall being intersected by a longitudinal counterbore along a dedicated sidewall section of said nipple, an isolation sleeve disposed in slidable, sealing engagement against the internal bore of said tubular nipple, said isolation sleeve being shiftable along the longitudinal axis of internal bore between alternative positions covering and uncovering the dedicated sidewall section of said mandrel or nipple.
11. Well completion apparatus comprising, in combination:
-a packer having anchor.slips for engaging a well casing and having a longitudinal bore for passing a perforating gun to and from a well location below the packer; 18 production tubing coupled to said packer for suspension within the well; a nipple coupled to said production tubing for suspension within the well, said nipple having a tubular sidewall and a longitudinal production bore, said tubular sidewall being intersected by a longitudinal counterbore along a dedicated sidewall section of said nipple, wherein said production bore and counterbore together define a service chamber; an isolation sleeve disposed in slidable, sealing engagement against the production bore of said tubular nipple, said isolation sleeve being shiftable along the longitudinal axis of the tubular nipple from a first position in which said dedicated sidewall section is of the tubular nipple is uncovered and exposed for perforation by a perforating gun, to a second position in which said dedicated sidewall section is covered by said isolation sleeve; and coacting latch apparatus coupled to the production tubing and to the perforating gun for locating said perforating gun within the service chamber of the tubular nipple.
12. Well completion apparatus as defined in claim 11, the tubular sidewall of said nipple having first and second end portions, said dedicated sidewall section being disposed intermediate said first and second sidewall end portions, said first and second sidewall end 19 portions being adapted for sealing engagement with said isolation sleeve when it is in the fully extended position.
13. Well completion apparatus as defined in claim 11 or claim 12, the tubular sidewall of said nipple having first and second end portions, said dedicated section being disposed intermediate said first and second sidewall end portions, wherein the radial thickness of said dedicated sidewall section is less than the radial thickness of said first and second sidewall end portions.
14. Well completion apparatus as defined in any one of claims 11 to 13 including first and second is longitudinally spaced annular seal members disposed in slidable, sealing engagement between said isolation sleeve and the production bore of said nipple, said isolation sleeve spanning said sidewall section of said nipple and sealing said sidewall section when the sleeve is in said covered position.
15. well completion apparatus as defined in any one of claims 7, 8 or 11 to 14, including a coupling sub connecting said tubular nipple to said packer, said coupling sub having a tubular sidewall radially intersected by an internal, annular locator slot, and said latch apparatus including a resilient latch arm mounted on said service tool, said latch arm being movable from a retracted, non-interfering position to a radially extended, latched position in which said latch arm is received within said locator slot.
16. A method for completing a well comprising:
suspending a flow conductor and a production nipple within a well casing; pumping cement into the annulus between the production nipple and the well bore; removing residual cement from the bore of the production nipple; and perforating the production nipple and the annular cement deposit with a perforating gun.
is 17. A method for completing a well as defined in claim 16, including the step of locating the perforating gun in registration with a dedicated section of the production nipple by latching the perforating gun onto the flow conductor at a predetermined latching location relative to the production nipple.
18. A method for completing a well as defined in claim 16 or claim 17, including the step of isolating the production nipple by covering the dedicated sidewall section with a tubular sleeve.
19. A production nipple constructed and arranged for use and operation substantially as described herein with 21 reference to the accompanying drawings.
20. Well completion apparatus constructed and arranged for use and operation substantially as described 5 herein with reference to the accompanying drawings.
21. A method of completing a well substantially as described herein with reference to the accompanying drawings. 10
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US07/950,456 US5361843A (en) | 1992-09-24 | 1992-09-24 | Dedicated perforatable nipple with integral isolation sleeve |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9319590D0 GB9319590D0 (en) | 1993-11-10 |
| GB2271131A true GB2271131A (en) | 1994-04-06 |
| GB2271131B GB2271131B (en) | 1996-09-25 |
Family
ID=25490454
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9319590A Expired - Fee Related GB2271131B (en) | 1992-09-24 | 1993-09-22 | Dedicated perforatable nipple with integral isolation sleeve |
| GB9406218A Expired - Fee Related GB2276648B (en) | 1992-09-24 | 1994-03-29 | Well completion apparatus |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9406218A Expired - Fee Related GB2276648B (en) | 1992-09-24 | 1994-03-29 | Well completion apparatus |
Country Status (5)
| Country | Link |
|---|---|
| US (2) | US5361843A (en) |
| CA (2) | CA2106921A1 (en) |
| GB (2) | GB2271131B (en) |
| NO (1) | NO308752B1 (en) |
| SG (2) | SG48227A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2276648A (en) * | 1992-09-24 | 1994-10-05 | Halliburton Co | Well completion apparatus |
| CN101988375A (en) * | 2009-07-31 | 2011-03-23 | 浙江金龙自控设备有限公司 | Intelligent tractor hoist of deep well in oil field |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB2276648A (en) * | 1992-09-24 | 1994-10-05 | Halliburton Co | Well completion apparatus |
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Also Published As
| Publication number | Publication date |
|---|---|
| GB2276648B (en) | 1996-07-17 |
| GB9406218D0 (en) | 1994-05-18 |
| CA2106921A1 (en) | 1994-03-25 |
| GB2276648A (en) | 1994-10-05 |
| NO308752B1 (en) | 2000-10-23 |
| NO933319D0 (en) | 1993-09-17 |
| CA2120108A1 (en) | 1994-10-01 |
| SG47824A1 (en) | 1998-04-17 |
| GB2271131B (en) | 1996-09-25 |
| US5390742A (en) | 1995-02-21 |
| US5361843A (en) | 1994-11-08 |
| GB9319590D0 (en) | 1993-11-10 |
| SG48227A1 (en) | 1998-04-17 |
| NO933319L (en) | 1994-03-25 |
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| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20030922 |